Fix crash on iOS 26 when printing ErrorCode initialized from NSError

[staskus]

WOOMOB-660

Description

This PR fixes a crash occurring on iOS 26 when converting certain NSError values into ErrorCode using ErrorCode(_nsError:).

Problem

On iOS 26, some NSError instances, especially those from the Stripe SDK, cause a fatal crash when converted to ErrorCode and accessed or logged (e.g., print(errorCode.code)).
This crash does not occur on iOS 18.5, including on simulators.

Example that triggers the crash:

let errorCode = ErrorCode(_nsError: NSError(domain: "com.stripe.terminal", code: 2020, userInfo: [:]))
print(errorCode.code) // Fatal error on iOS 26

Notably, not all error codes cause this behavior. Some values are fine, while others fail, regardless of whether the code is valid or known to the Stripe SDK.

The issue can be seen using lldb

(lldb) po ErrorCode(_nsError: NSError(domain: "com.stripe.terminal", code: 2020, userInfo: [:])).code

SignalCompression/SignalEncoder.swift:261: Fatal error: Unknown error
.SCPErrorCanceled

Solution

For now, avoid calling errorCode.code, and calling errorCode.errorCode instead.

We will get in logs:

💳 Stripe Error Code: 2020

instead of

💳 Stripe Error Code: SCPError(rawValue: 2020)

Stripe Report: stripe/stripe-terminal-ios#362

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Steps to reproduce

I only tested on iPadOS 26 (simulator and device), and wasn't able to check iPhone TTP crashes. To reproduce a crash on iPadOS:

1. Turn on simulated card reader
2. Open POS
3. Connect to card reader
4. Check out
5. Come back to cancel the order
6. It should crash on trunk without the fix, and shouldn't fix here

Testing information

Additionally, it was tested on an iOS 26 device and there's no more crash. There's only an expected "unsupported software version" since TTP shouldn't work on the beta releases (https://docs.stripe.com/terminal/payments/setup-reader/tap-to-pay?platform=ios#supported-devices)

Screenshots

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• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce iOS Prototype by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS Prototype
	Build Number	pr16000-1a11ed7
	Version	23.0
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	1a11ed7
	Installation URL	5ftmvtnpm8fjo

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[joshheald]

Works well, and it's an improvement to the log message IMO. Thanks!

I've tested on an iPadOS 17.7.2 physical iPad, and an iPadOS 26.0 simulator.